POL Government Elected Officials Auditor Mary Hull Caballero Charter, Code and Policies City Code & Charter Online Code & Charter Title 19 Chapter 19.16  Rules And Regulations
19.16.205 Respiration Protection Required.

Any stevedoring company or any person engaged in working sulfur or any cargo of poisonous compounds or other commodity whereby any person working in or around such cargo may be overcome by dust or fumes or gases from such cargo, shall have at hand for immediate use suitable respiration protection equipment approved by NIOSH.